If you want compact, in-ear earbuds with a choice of six tip sizes for sleeping, choose Back Bay Audio Mini; if you need an open-ear design that leaves your ear canals uncovered, choose TOZO O2. For side-sleeping, neither is a dedicated headband headphone, but the Back Bay’s small in-ear profile is the more relevant option to consider.
The deciding factor is fit, not a contest over battery life: TOZO lists more total playtime, while Back Bay offers a snug, sound-isolating fit and a stated IPX7 rating.
• Back Bay Audio Mini: Six ear-tip sizes and a small in-ear profile are its biggest strengths; the trade-off is that its fit plugs the ear canal, which may be uncomfortable when sleeping on your side.
• TOZO O2: An adjustable open-ear fit and up to 42 hours of total battery life are its biggest strengths; the trade-off is that it does not seal the ear, so it is less suited to blocking outside sound.
• For sleeping: Back Bay is the more plausible fit to try, especially if small earbuds usually work for you. Neither product is described as a sleep-specific headband headphone.
• For open-ear listening: TOZO is the clear fit for anyone who wants to keep their ear canals uncovered.
• For small or hard-to-fit ears: Back Bay’s six tip sizes offer more ways to adjust the in-ear fit; TOZO instead adjusts its open-ear angle.
Back Bay Audio Mini is the pick I’d look at first if small earbuds tend to fit you better than standard in-ear models. The design includes six tip sizes, ranging from extra-small to XXL, so you can try different sizes rather than relying on one fixed fit. It also has a small profile, an in-ear design, and sound isolation. For someone looking for the best in ear headphones for sleeping, that compactness makes it more relevant than an open-ear model—but it does not guarantee comfort when your head is against a pillow.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-23 · 6 min read · Independent comparison
The battery setup is straightforward: the earbuds are listed for eight hours of playback, with another 24 hours available from the charging case, for 32 hours in total. USB-C charging is supported. There’s also an extra-bass mode, Bluetooth connectivity, and an IPX7 rating. The water-resistance information specifically says these are not for swimming, so I would not treat that rating as permission to use them in a pool.
This is the more sensible choice if you want your ears covered by an in-ear seal, need several tip sizes to work with, or want a small pair you can also use for music, workouts, and calls. I’d skip it if you dislike the feeling of an earbud inside your ear or know that even small earbuds press uncomfortably against a pillow. A sleep headband is a different kind of product, and the Back Bay’s small profile alone doesn’t make it one.
TOZO O2 takes the opposite approach. These are open-ear earbuds, designed to sit without plugging the ear canal, and their dual-axis adjustment lets you change the angle horizontally and vertically. That makes them a better match for someone who wants to listen while remaining aware of sounds around them. The open construction may also appeal if you find conventional in-ear buds uncomfortable, though the sheets don’t establish how the adjustable fit feels for any particular person.
Battery life is a point in TOZO’s favor on paper: up to 12 hours of playback from the earbuds and up to 42 hours total with the case. The O2 also supports connecting to two devices at once and using just one earbud. Its 14.2 mm dynamic driver, app compatibility, and five preset equalizer settings give you options for shaping playback, while DSP noise cancellation is specified for calls.
I’d choose TOZO for daily listening, calls, or activities where leaving the ear canal uncovered matters more than isolating sound. The trade-off for sleeping is that an open-ear shape sits around the ear rather than nestling into it. The product information does not describe it as a sleep design, so I wouldn’t assume it will stay comfortable against a pillow. Its IPX6 rating is listed for sweat and light rain; that, too, is not a claim that it is suitable for swimming.
• Best fit to consider for sleeping → Back Bay Audio Mini. Its small in-ear profile and six tip sizes make it the more relevant option. Pillow comfort still depends on your ears and sleeping position.
• Best if you want your ear canals uncovered → TOZO O2. Its open-ear design is made for listening without plugging the ears.
• Best for trying different in-ear tip sizes → Back Bay Audio Mini. It comes with six sizes, from extra-small to XXL.
• Best for adjusting an open-ear fit → TOZO O2. Its dual-axis design allows horizontal and vertical angle adjustments.
• Best listed total battery life → TOZO O2. It is specified for up to 42 hours with the case, compared with 32 hours for Back Bay.
• Best for sound isolation → Back Bay Audio Mini. Its listed noise control is sound isolation; TOZO’s open-ear design does not form an in-ear seal.
• Best for two-device connection → TOZO O2. It supports connecting two phones simultaneously and can also be used with one earbud.
• Best if you want extra bass mode → Back Bay Audio Mini. It offers a bass mode activated by tapping a button.
• Best fit for workouts or light rain → Either, with different ratings. Back Bay lists IPX7 and says it is not for swimming; TOZO lists IPX6 for sweaty or lightly rainy use. Neither rating makes these swimming earbuds.
I’d choose Back Bay Audio Mini for sleeping because its small in-ear design and six tip sizes give it a more practical starting point than TOZO’s open-ear fit. That is a fit-based recommendation, not a promise that an earbud will feel comfortable under a pillow. If keeping your ears open matters more than blocking sound, I’d choose TOZO O2 instead. For a dedicated headband headphones for sleeping design, neither of these is the product type I’d look for.
Back Bay is the more relevant choice because it has a small in-ear profile and six tip sizes. TOZO O2 is open-ear, and its information does not describe it as a sleep-focused design.
They are open-ear earbuds, so they do not form the same in-ear seal as Back Bay. The listed DSP noise cancellation is for calls; it should not be confused with noise isolation for listening.
TOZO O2 lists up to 42 hours of total playtime with its case. Back Bay Audio Mini lists 32 hours total, including eight hours from the earbuds and another 24 from the case.
Both list water-resistance features. Back Bay specifies IPX7 and says it is not for swimming; TOZO specifies IPX6 and mentions sweat and light rain. Check the current product information for the use conditions that matter to you.
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